The next day, after lunching at Undurraga, I was starting to wonder if I was only touring the best of the best wineries, that eventually I would hit a wall. But then the good stuff kept coming. At Casas del Bosque in Valle de Casablanca, I tried a Sauvignon Blanc that has to be one of the world’s great bargains at $16 retail and a $20 Syrah that tops most of its competitors selling for three times as much.

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